ApiGateway WebSocket - How to override requestId? Or any other way to get reception confirmation of messages sent.

Hi, ApiGateway docs says that it is possible to override requestId with HTTP by overriding a header. But it says nothing about a way to do it when using websockets. How can i override requestId to get confirmation that message was well received? by requestId or any other solution identifying my sent message, It must be handled directly by ApiGateway, and not depending on a Lambda triggered or any consuming processing... I already have a integration response, and get for exampleconnectinId properly, but the requestId being generated by ApiGateway itself, i cant indetify back the sent message myself. Thanks